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The xdg desktop file specification allows for icons to be either a absolute path just a name. If the name is not an absolute path, a icon from a icon theme will be used. This commit changes the desktop file to use a icon name and adds the icons to the default theme (hicolor). This allows the user to choose an alternative icons theme that will override the default icon. The relevant specs: https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s05.html > Icon to display in file manager, menus, etc. If the name is an > absolute path, the given file will be used. If the name is not > an absolute path, the algorithm described in the Icon Theme > Specification will be used to locate the icon. https://specifications.freedesktop.org/icon-theme-spec/latest/ar01s07.html > Installing Application Icons: [...] Minimally you should install a > 48x48 icon in the hicolor theme. This means installing a PNG file > in $prefix/share/icons/hicolor/48x48/apps. https://specifications.freedesktop.org/icon-theme-spec/latest/ar01s03.html > Icons and themes are looked for in a set of directories. By > default, apps should look in $HOME/.icons (for backwards > compatibility), in $XDG_DATA_DIRS/icons and in > /usr/share/pixmaps (in that order). https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables > $XDG_DATA_DIRS defines the preference-ordered set of base > directories to search for data files in addition to the $XDG_DATA_HOME > base directory. The directories in $XDG_DATA_DIRS should be > seperated with a colon ':'. > If $XDG_DATA_DIRS is either not set or empty, a value equal to > /usr/local/share/:/usr/share/ should be used.